Answer
Epicureanism, the ancient philosophical school, served as the primary focus of Gassendi's engagement. This philosophical system, rooted in the teachings of Epicurus, emphasized the pursuit of pleasure, the concept of atoms as the fundamental building blocks of the universe, and the idea of a tranquil and serene existence. Gassendi delved deeply into the Epicurean philosophical tradition, contributing significantly to its revival and dissemination during the 17th century.